Transcript for Emory Hospital in Atlanta Prepares for Another Ebola Patient

We turn now to Atlanta where the hospital treating America's first ebola patient is preparing for a second one to arrive. Everyone hoping for another encouraging image like the one we saw yesterday. Dr. Kent Brantly climbing down from the ambulance and entering the hospital walking on his own two feet. ABC's chief medical editor Dr. Richard Besser is at that hospital for us tonight. Reporter: Tonight the only ebola patient on American soil waits to see if his body will fight the deadly virus. Stepping off the ambulance yesterday under his own power. Much to everyone's surprise. To see him walk, which hadn't even occurred to me, was just unbelievable. Brantly has also seen and spoken to his wife. Using a phone through a glass window. In the process of designing this unit allowed for a lot of face to face contact through a plate glass window together with a communication system so that they will be as close as one to two inch from each other. Reporter: Amber said she came out grinning ear to ear. Is very hospital mistic about his recovery. Tonight she says he's improving but remains isolated until he's no longer contagious. If the patient is stable, most people feel they're contagious for about two to three weeks. Reporter: The staff is getting ready for another ebola patient. Nancy writebol. Brantly's colleague. A short time ago the same plane that brought Brantly back to the U.S. Took off on a trip to Africa expected to bring writebol back here on Tuesday. Tonight we learned he received a dose before leaving. The outbreak has led to the question, why aren't there approved drugs to treat or vaccines to present this deadly disease? There's been progress but human trials have barely begun. It would be helpful to protect health care workers. It's a long way away and uncertain. Reporter: When the plane arrives in Liberia doctors will need to quickly determine whether Nancy a stable enough for travel. If she can make the trip, she can arrive as early as Tuesday. We wish her well.

This transcript has been automatically generated and may not be 100% accurate.

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